remove unused "q" dependency

package.json

@@ -47,7 +47,6 @@
     "jshint-stylish": "^2.1.0",
     "load-grunt-tasks": "~3.2.0",
     "moment": "~2.21.0",
-    "q": "~1.4.1",
     "tether-drop": "^1.4.2"
   },
   "dependencies": {

yarn.lock

@@ -4042,10 +4042,6 @@ q@^1.1.2:
   version "1.5.1"
   resolved "https://registry.yarnpkg.com/q/-/q-1.5.1.tgz#7e32f75b41381291d04611f1bf14109ac00651d7"
 
-q@~1.4.1:
-  version "1.4.1"
-  resolved "https://registry.yarnpkg.com/q/-/q-1.4.1.tgz#55705bcd93c5f3673530c2c2cbc0c2b3addc286e"
-
 qs@~0.5.2:
   version "0.5.6"
   resolved "https://registry.yarnpkg.com/qs/-/qs-0.5.6.tgz#31b1ad058567651c526921506b9a8793911a0384"